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How can I list all updates installed on Mac OS X?

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The way updates are recorded has changed considerably between versions of OS X; both of the answers I see os far apply to Snow Leopard (10.6), so if you're concerned with another version, please specify. – Gordon Davisson Oct 28 '10 at 17:06
up vote 8 down vote accepted

The list of all installed updates is located in /Library/Receipts/InstallHistory.plistif you don't want to use the Software Update preference pane.

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includes lots of additional software installed (or not) in addition to the stuff managed by the OS. – user31752 Oct 28 '10 at 18:07
There's also /var/db/receipts/, which contains plist and bom files for most of the entries in InstallHistory.plist. – user495470 Aug 6 '12 at 15:21

System Prefs > Software Update > Installed Software.

Sort by date.

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The tab for installed updates was removed on 10.8. – user495470 Aug 6 '12 at 15:20

Open the System Information application which can be found in /Applications/Utilities. Then go to Software -> Installations and there you have it.

This solution works on old and new versions of OS X (I've tested it on 10.8.2).

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Use the following command:

/usr/sbin/system_profiler SPInstallHistoryDataType

Which is the command line alternative to "System Profile"

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